Nonlinear possibilities ========================== Law of behavior -------------------- The laws of behavior specific to these models, usable under COMPORTEMENT in STAT_NON_LINE and DYNA_NON_LINE, are the behavior relationships in plane constraints available with the 'AXIS' modeling (*cf.* [:external:ref:`U4.51.11 `]). Deformations ------------ Only linearized deformations with the keyword 'PETIT' under DEFORMATION are available in behavioral relationships (*cf.* [:external:ref:`U4.51.11 `]).